ELM600XB_17 Datasheet, PDF (1/7 Pages) ELM Technology Corporation – high efficiency synchronous PWM step down DC/DC converter

ELM600xB 1A 1.5MHz
high efficiency synchronous PWM step down DC/DC converter
http://www.elm-tech.com
■General description
ELM600xB is a high efficiency step down DC/DC converter operated with current mode and constant
frequency. The internal switch and synchronous rectifier are integrated for high efficiency. External Schottky
diodes are not required. The supply current is only 100μA during operation and drops to less than 1μA in
shutdown. ELM600xB can supply 1A of load current from 2.5V to 5.5V supply voltage.
The switching frequency is set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. It
can run 100% duty cycle for low dropout application. The output voltage of ELM600xB is adjustable from the
FB pin.
■Features
• Current mode operation
• Thermal shutdown protection and short circuit protection
• Constant frequency
: Typ.1.5MHz
• Output current
: 1A
• High efficiency
: Max.95%
• Shutdown current
: Max.1µA(Ven=0V, Vin=5.5V)
• Supply voltage
: 2.5V to 5.5V
• Low quiescent current
: Typ.110µA(Outgoing stopped)
• Full duty ratio
: 0 to 100% (in dropout)
• Package
: DFN6-2x2, TSOT-25
■Application
• Cellular phone
• PDA and smart phone
• MP3 player
• Digital camera
• Wireless and DSL card
• Microcomputer and DSP power supply
• Portable machine
■Maximum absolute ratings
Parameter
Symbol
Limit
Unit
VIN power supply voltage
Vin
-0.3 to +6.0
V
Apply voltage to SW
Vsw
GND-0.3 to Vin+0.3
V
Apply voltage to EN
Ven
GND-0.3 to Vin+0.3
V
Apply voltage to FB
Vfb
GND-0.3 to Vin+0.3
V
SW peak current
Isw
3.0 ^(*2)
A
Power dissipation
Pd
1000 (DFN6-2x2) ^(*3)
600 (TSOT-25) ^(*3)
mW
Operating temperature range
Top
-40 to +85
°C
Storage temperature range
Tstg
-65 to +150
°C
Caution:
* 1. Permanent damage to the device may occur when ratings above maximum absolute ones are used.
* 2. Output current must not exceed power dissipation specified in maximum absolute ratings.
* 3. Mounted on glass epoxy board (FR-4). (76.2mm×114.3mm×1.6mm : based on EIJ/JEDEC standard size), 2layers,
Cu thickness 35μm, Cu area : top side 20%, back side 100%.
7-1
Rev.1.0